-13=7b+6b

Solution for -13=7b+6b equation:

Simplifying
-13 = 7b + 6b

Combine like terms: 7b + 6b = 13b
-13 = 13b

Solving
-13 = 13b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-13b' to each side of the equation.
-13 + -13b = 13b + -13b

Combine like terms: 13b + -13b = 0
-13 + -13b = 0

Add '13' to each side of the equation.
-13 + 13 + -13b = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -13b = 0 + 13
-13b = 0 + 13

Combine like terms: 0 + 13 = 13
-13b = 13

Divide each side by '-13'.
b = -1

Simplifying
b = -1